Probably not worth it unless you need other pieces and parts but I just got some from Motobins. They have plain, folding, logo-ed and the prices are OK.
If you're just looking for any blank that will match (not Neiman), there are a couple that I was told work, maybe Taylor & Ilco? Seems like there's one that Volvo uses that's similar to ours.
As Bob says, not everyone will be able to deal with these. If you're not comfortable getting them online, call around to your local "real" locksmiths.
Sorry, I covered the end of mine with rubber and can't read the numbers.