Have you tried 1to1postcards?
From our experience we like 1to1postcards.com They have online design tools, or we can upload our pre-bilt designs. They allow us to upload our mail list, and thier prices have been great. We just got a coupon from them the other day that took about $34 off the total order (everything helps). The coupon code was bcsaver01 and we applied it to the shopping cart on checkout.
I think the coupon was intended to be for 500 business cards for $11.11, but we found it worked on multiple orders and the bottom line was it reduced the total bill by about $30 some odd $'s.
I am new to this forum - cool place, but been doing this stuff for awhile.