Does anybody have a wedge?
I don't have a wedge, but a friend has this type and I will comment that it is really good for people who have issues where they are more comfortable with the legs raised when in a supine position. Good enough that I have been considering to purchase one. It may be another option or something else you'd be interested in in the future. I am not sure it would be that good for pre-natals though... but you may find a way to make it work, thus giving you a more versitle wedge.
It looks huge, but is very comfortable.
After doing some research, it seems you can purchase a Leg Elevating Wedge in 4,6,8, and 10 inch heights. I am not sure the height of my friends, but I would guess it is the 8 or 10 inch as it looks quite high and made me wonder if it would be uncomfortable (even though it is not).
Duro-Med Ortho Bed Wedge with Blue Polyester/Cotton Cover, 8 x 20 x 24 $29.99
http://www.amazon.com/Duro-Med-Ortho-Wedge-Polyester-Cotton/dp/B0009STNC4/ref=pd_bxgy_hpc_img_b/189-5588404-3050952
Bed Wedge/Alex Orthopedic Support $54.99
http://www.comfortchannel.com/prod.itml/icOid/10450