I recently bought few items from www.MuayThaiChampion.com
I haven't received them yet, but Marc was very helpful, responding to all my question by email. They seem to have most Twins products in stock and even Top King items that usually have long manufacturing time. Let's see how it goes. Also www.MuayThai-Fighting.com
seems quite popular amongst members on this site. They seemed a bit less helpful though through email, but they are a bit cheaper.
I ordered, amongst others, a pair of Twins gloves....Can''t wait!
Ps. Muay Thai Champion gives you a tracking number at "Quantium Solutions", where you can follow your packages on a daily basis. They also ship through FedEx.