Local tour guide/driver in Oaxaca?

If you can't locate one you will be able to find a taxi no problem that will be happy to do this. Just ask you hotel to get you someone and negotiate an hourly rate. I wouldn't miss Mitla if you go out that way. What I like to do is to go to Mitla first arriving at around 10:00 a.m. check out the ruins and church that go back to Tlatcolula. Although I like Teotitlan is it really quiet on Sundays. A lot of the weavers go to Tlatcolua. If you have a driver you can get around fast and you might want to add Yagul and Tule too depending on how ambitious you are. This is a route where you can really see a lot. Last, this can all be done with public transportation as well if you are interested.

Agreed, a private taxi or collective taxi driver could shuttle you around. Tell them your route and negotiate a price, or ask your hotel manager for a recommendation. Public transport is fine, and has much more reasonable rates, but less convenient. You could add some more destinations to your second day, unless you plan to spend a lot of time at each archaeological site. I don´t believe sites will be closed 25 Dec, but businesses may open later. I´m sure guided tour agencies could offer a package for you too; check the Alcala.

Just for comparison, here are some approx prices: public bus from Oaxaca to Mitla: 25 MXN; vs collective taxi from Oaxaca to Mitla: 40 MXN per seat; so if you were to hire a taxi for yourself, for a return trip to Mitla, I would estimate the price at 200 MXN per one way trip (basically the price of all five seats), or 400 MXN; plus add 100 MXN for each hour you want the driver to stop somewhere and wait. Local guides can be found at each site.

Atzompa is a small site, and won´t take more than an hour in my opinion, but there´s also a community museum below the site that´s worth a visit. Monte Alban, of course, is a much bigger site. Teotitlan del Valle also has a community museum that I liked.

I talked to a tour operator today, and they only charge 200 MXN for a day tour to Mitla, with several stops, for only 200 MXN (plus admission fees). Hard to beat that price if you´re pressed for time.

Wow... amazing information. Thank you so much!! The couple of people I've already been in touch with charge 400 pesos per hour and are basing all sites on an 8 hour tour approx.
As its a Sunday, I have decided I'm going to try to do Milta, Tlacolula Market, Yagul Ruins, and Teotitlan del Valle all in one day.
Then another day do Mt Alban, Aztompa and San Bartole Coyotepec
Do you have the name of the tour guide you spoke with/an email address at all?

Plus, do you live in Oaxaca? Have been trying to confirm accomodation I have booked at Casa del Sotano arriving on the 22nd and after 2 weeks I am yet to hear back from them via email... :)

This was just the first tour guide tout I ran into in the Alameda; they´re there every day. Perhaps it was San Tours. Mexicans don´t reply promptly by email. The price you were quoted may have been for a custom tour (although it sounds standard to me).

Don't miss a visit to the Tule Tree as it is fantastic.

As its a Sunday, I have decided I'm going to try to do Milta, Tlacolula Market, Yagul Ruins, and Teotitlan del Valle all in one day.

You can do this if you move along and I think it is worth it. When in Mitla and Teotitlan note how the churches were built on top of indigenous structures, it is quite amazing. Great view from Yagul.

Couple of comments on your other itinerary. You can do Monte Alban well in a half day. Buses depart direct from Calle Mina from Hotel Riviera Angel. I don't know if Arrazola is worth it anymore or not. I see less and less in the wood carving villages as buyers buy up the alebrejes or they are sold in Oaxaca City. A nice route after Monte Alban would be ex convento at Cuilapan, on to Zachilla, look at the tombs and check out the town, then over to Coyotepec. It is roughly a loop from Oaxaca City. This can easily be down with taxis, or colectivos.

Or if you really like Monte Alban you might be interested in the new section that opened a couple of years ago over by Atzompa. I really like it. Whatever you do you should have fun. I have a trip coming up shortly to OAX as well and am looking forward to being back in town.

I´ve talked to a couple more tour touts. The one from San said their price was 300 MXN, but their tour was better than the one that cost 200 MXN! (As an aside, I had to confirm the price in both English and Spanish) Today I was quoted 250 MXN from another agency.