I just had to share this. Overnightprints.com is having a sale until JULY 12. Postcards at half price.
I have heard OvernightPrints.com to be recommended by some in the crafting community.
You can use their designs or upload your own.
Postcards are a great way to showcase your busienss - hand out as business cards, send to customers with a discount code, place on counters at beauty shops, etc....
http://bit.ly/r1yPZ