It's from the video Ticklish Merchandise (that one is golden). You're in luck that one has been digitalised, even though it's a bit of a jigsaw puzzle. The separate clips can be bought on:
http://clips4sale.com/tickling-handjobs-female-orgasm
If you want all 30 minutes of Crystal getting tickled in Ticklish Merchandise you'll need the following videos:
TC5009
TC5148
TC5149
TC5189
TC5246
(I tend sort my clips per production, original video and model).
About Classic Realtickling it's sad they haven't digitalised the entire Happy Hour 2000 video. They used to sell that on VHS back in the day, I know. That one also has Crystal tickled in a rug.