I think the problem is that while your machine may be a workhorse, Janome don't make a lot of accessories specifically for their cheaper machines, so the only one available us a customised table. Couling have it a whole £10 cheaper but it's still a lot of money.
My pfaff came with a Horn custom table and, tbh, it's nowhere near as useful or functional as the flip leg one that came with my Janome. It doesn't fit the contours of the machine very well and I end up constantly pulling heavy fabric over the snaggly bits, which defeats the object.