Nikon 105mm f/2.5 manual focus, in either the Ai version, with the separate lens hood, or the AiS version with the built-in, sliding lens hood. Both of these lenses have nice bokeh--not "world class", like the 85/1.4 AF-D or 105 f/2 DC or 135 f/2 DC or 200 f/2 VR lenses, but these two manual focus 105mm lenses are small,light weight, sturdily built, and are available on the used market fro around $225 US dollars in excellent condition, and substantially less in cosmetically beat-up condition. The "one-oh-five two-point-five" is/was a super lens. It also has an excellent manual focusing action,with a very easy to use focusing system, even on a d-slr.
For a bargain bokeh lens, the 85mm f/1.8 AF-D lens is a pretty good modern, autofocusing choice for those on a budget.
The low-priced 85mm f/1.4 manual focus but CPU-equipped Vivitar Series 1 or Bower lens, sold in the USA through
Adorama and
B&H Photo is quite a lovely bokeh lens. This lens is also sold under the Sanyang brand IMMSMC,and it is sort of a cult lens among the bokeh crowd. $329 US new.