Spinettis is a vendor here and a member. They are very helpful if you ever have questions you can just email them. Very friendly.
For singles you can also put up a Wanted ad here too. Lots of singles sales happen here but it helps to post an ad or search past listings or mentions of the chips you want and then start PMing people to track them down. Mostly very helpful and friendly people here. Also eBay can be good for si goes if you know what you should be paying and take your time.