San Diego's newest dive shop, SDUA has since it opened offered free Nitrox fills to its members with a monthly fee of $55. They have recently added a trimix level. $75 per month membership (1 year membership contract and then it goes month to month). The membership provides you with free standard trimix fills as well as
deco bottle and argon gas fills.

The standard mixes are familiar to GUE divers (21/35, 18/45, 15/55 and 10/70). I will be joining despite the fact that I am in Vancouver most of the month.