Okay, I have now used the TSP Gear Store website

so here's some feedback on the store itself...
It would be nice to have a "FAQ" or "Doing Business" link, with info on ordering, payment, shipping, returns, and so forth.
As actual products arrive, replace the Photoshop mockups with photos of the real things.
Product descriptions should have more detail, since some customers will not be reading about them on the forum. For example, the hats are currently just "100% Cotton Embroidered Ant Hats". How about "Crafted in Mauritius from heavyweight 100% cotton twill, these durable caps feature a 3" brim, an adjustable band, and an embroidered ant. Hand wash, line dry." Or something like that.
I don't know if you have any control over the Paypal shopping cart, but it insists on resizing my browser window to a narrow width. (Minor annoyance.)
Other than that, I thought the website design and functionality were very good. Everything seemed to work, and the Paypal shopping cart was straightforward to use. Good job!