Plain paper  or post card?

I'm thinking, my letter needs work and maybe I should do post cards since they are cheaper (but they have a lower response rate).  

Postcards, zip letters.

COIs - Centers of Influence - I like Financial Planners to network withPaid Marketing@Michael Quarles are all pros at paid direct response marketing (post cards, yellow letters, zip letters, etc)

I was thinking about hitting it with postcards then another round of yellow letters, then I'm gonna attack a new list.

I'm using Chris chicos absentee owner postcard and yellow letters and results are good..I'm not saying there are not motivated sellers, I was just wondering if anyone follows up with the crappy leads because I would hate to be leaving money on the table or wasting money on mailing..it would be nice to monetize every lead if possible.

I have tried oversized and undersized postcards in split tests, and they just dont convert as well. 

If you want to check out samples of postcards I have sent out I uploaded a couple in the BP fileplace.Frank

If my first mail piece was a yellow letter and now I'm sending a postcard, do I change all the numbers-- and now need 18 numbers-- or do I keep one number throughout the whole campaign?

They have super nice postcards, innovative "zip letters" and of course LETTERS.