hi there,
I had a .5 mm before...cant remember who made it though, sorry. You should be able to find something...but I´d suggest interwebbery, as long as you have an address for shipping. Actually, I just remembered, I picked it up in Mermaids in Bangkok, so you could call them and ask.
But really, you want to get your suit based on what thermal protection you will need, not on any bouyancy issues. No matter what suit you wear, it should be possible to get your weighting and trim correct. I personally switch between a 3mm and a .5mm in the tropics....sometimes that 4th dive of the day gets well chilly. Or, you could think about getting a hooded vest too, covers just your head and torso, and that would be perfect to wear under the 1mm if it gets too cold.
Make sure that a 1mm is enough for you before buying one. Hopefully not to cause any offence, but sometimes the fairer sex struggle a bit in colder water...not like us stoics...we´d rather turn to ice then call a dive because we´re nippy. Also, just some random advice that you didnt ask for....I would get a full suit, not a shorty...especially if you go for the 1mm...warmer but importantly, better if you run into some annoying stingers.
Hope that helps, enjoy yourself,
Ferg