Love the idea but not sure where to go for supplies..

I have been toying with the idea of creating customized greeting cards, thank you cards etc... to sell - mostly hand-drawn/doodles and putting them up in Etsy.  I'm not sure though where I can source the paper and the envelopes, does anyone have any idea where I can get this cheap? Like I don't want to be charging people an arm and a leg for the cards.  But I'd like to sell quality paper and oh, I love texture, so if you know where to get beautiful textured paper please let me know.  If anyone has any suggestions, please do send me some links, I would appreciate it very much ;) They will be printed on my Epson Photo Stylus R1800. 

Here are some sample stuff, do you think anyone would buy them from me?

This is the raw version, drawn on textured Avery half-folded card paper, the problem though is that I used markers (Touch, Kurecolor) similar to Copic and they bled through the back.

 

This is the digitized version, scanned my drawing and extracted in photoshop.  I want to print this on nice heavyweight textured paper.

Another one of my doodles, this is on my blog header ;) Just wanted to experiment, hehe. 

So what do you think?