If we're talking about the agreement, SLAs that are better than 99.9% are quite common, and available even on low end products. The problem is that the SLA pa

If we're talking about the agreement, SLAs that are better than 99.9% are quite common, and available even on low end products. The problem is that the SLA payout is usually "we refund you for the time you were down, if you ask for the refund" - heck, with that payout, I'd be happy to give you a 100% SLA on any product I sell. (of course, I'm not going to advertise as such; the sort of people who buy from me would find that disingenuous.) That said, I think you are about right with 99.5% being about the best you can expect while spending a reasonable amount of money. (especially for a static site, i think a few more tenths of a point is possible for less money than you think, but the cost curve goes parabolic sometime after 99.5%)