Debbie, my recommendation for products you should carry are:

1) Pureology Hydrate Shampoo and Conditioner - <!-- m --><a class="postlink" href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350211371552">http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0211371552</a><!-- m -->
I can't praise this product enough. It softens the hair wonderfully and really locks in the colour. I've had great results with it. Combined with Nearly Natural, and you have the perfect solution for ultra soft, non-fading hair.

2) Coolpiece Oil-Resistant White glue
I'm by no means a huge fan of Collpiece stuff, but I have to hand it to Jeff for getting it "just right" with this glue. It's really amazing, and for a white glue, you can get 1 full week of a solid hairline attachment with no touchups. And it seems to be pretty sweat/water resistant. I haven't seen anything like it, and it's working better for me than other similar white glues. *Disclaimer* This glue is pretty useless when you first get it - it needs to be left open for 24 hours, and then it will get a little thicker, and more useful. Leave it open until it has gotten visible thicker.