I found them: http://wiggys.com/moreinfo.cfm?Product_ID=197
I wrote to Wiggys and asked how many tie-outs were on there liners. Wouldn't be a big deal to sew your own if the stock liners come with only four.
Looks like a good deal for ~$45.00. Will probably grab one and experiment close to home with a pad, SB, and extra gear.
I'll let you all know what Wiggys has to say.