Recommended Folding Bike for Hybrid Commuting? (Bus/Car + Bike)
For those requirements I would be tempted to get a scooter. Our Jeff has a blog post up on that topic. For 1.5 miles a scooter is a useful compromise in the direction of "tiny but usable".

Otherwise if you want to try a folding bike just about anything cheap will do. This question compares two bikes at about $US200 each. For 2 mile trips it's not too important, and spending a lot of money for something that is better for other situations doesn't really help.

But for me, I'd rather pay a little more and get something that will be more versatile and last longer. For $300-$400 you can get an actual bicycle that fold and can be ridden (rather than a bicycle shaped object). Brands like Dahon are reasonable and cover the range from quite cheap ($US490) to slightly insane ($US2700+) and they're available worldwide (There are cheaper Dahons but they don't seem to be on that website - there's a single speed Boardwalk, but you have hills so it probably won't work). Further up the cost scale you get Brompton (folds small) and Birdy (rides well) as well as others. But $1000+, so hard to justify for your needs. 

Most of the 20" wheel folding bikes go small enough to get them into the luggage space of a small car, but you may find that you can't get anything else in there at the same time. Smaller wheels (usually 16") generally mean the bike folds smaller but suspension becomes even more important. But again, not for a couple of miles each way. I suggest taking your car along to a shop that stocks a few folding bikes and having a play.

edit: given your size I doubt a cheap bike will last very long. They're just not built for it. I'm only 185cm/90kg and most folding bikes feel pretty flimsy to me. I suspect the Dahon Boardwalk D7 I linked to before is the least worst option under $500. To get really rigid at your size you'd need something like a Bike Friday or Airnimal.