Whatever it is. There's some more new blood sat in my hallway John, if you ever need stud services.

I just wish some of the shops would challenge the naming - if I owned a shop in wouldn't deal with a supplier who didn't work with scientific names, if you know the scientific name you know it's not a "Northern Garter Snake". At the end of the day I think the shops just want garters on the shelf to cater for freaks like us (who won't buy a boa or python) and as a smaller snake to sell to people who look a the pythons and say "oooh, that's a bit big". I haven't heard of any shops that really care to supply garters, perhaps Coast to Coast is the closest but even there it seems to be a second or third line of sales.
Sod it, continental breeders are the way to go. Or you need to know the garter people who have breeding pairs.