I did buy a scope last week (actually, two, but the second half of this story will come next week): I found a Tektronix 514AD on Craigslist.
This scope has some interesting features: It was the first scope to offer both a 10-MHz bandwidth and DC response (the 511 only had the former, the 512 only had the latter). The 514AD version include a 24-section 250-ns LC delay line. It also includes (I am told) tons of selenium rectifiers. Fun!