Buying pregnancy pillows?

Angela • My husband and I have a 2 year old little boy and are pregnant with baby #2
I'm starting to have trouble sleeping because I just can't get comfortable. Before I got pregnant, I slept on my back about 80% of the time and on my stomach the other 20%. Since I can't sleep in either of those positions now, can anyone recommend a good pregnancy pillow? And I don't really want to pay a bundle. Thanks!