The Dansie Shopping Cart works just fine with wordpress. You can use the html tab to insert your click to purchase buttons on your post. Upload your photo, scale a thumbnail and insert your click to purchase code. Pretty easy to do! I have not tried using more advanced forms. Below is a sample test to see if it will work. If you check out you won’t get a refund. =)

Test Product
Price: $1.00

 
A more advanced form:
Mens Tie
Price: $40.00
Size: