dunno about the price - it's probably not going to be that much cheaper anywhere else...
Re the repairs...
look here for advice: http://www.henshaw.co.uk/default.cfm/loadindex.125
I just carried out some repairs myself recently - where the tapes covering the seams on my tubes was lifting. Avon recommended the Bostik 2402, its 2 part glue - very easy to mix up and use.
I checked first with Polymarine - they told me they had a suitable product, but advised me to look locally myself first - because the glue is classed as a hazardous product - and shipping it would be expensive.
Making the repairs was as simple as pie. I cleaned the old glue off first - I first used an hacksaw blade as a scraper to clean off the big stuff (using a scraping motion - not a cutting motion !!) - the I sanded it with coarse sandpaper. I then cleaned the whole area with acetone (again - readily available in the local chandler/rib supply store....).
There were no instructions re proportions for mixing the two parts of the glue - so I made a rough guess - about a quarter of the container of each. For a mixing vessel - I got an old 2 litre coke bottle and cut the bottom part off. Keep the top part (it makes a useful funnel!)
Then I followed teh advice on the Henshaws page for applying the glue - spread a layer of glue on both surfaces, let it set till it's not tacky, then spread another thin layer of gle, let it go off, then press the 2 surfaces together. I didnt have a seam roller available - so I used a plug spanner socket.
The stick worked a treat. I didnt roll it enough, because there's still a tiny air bubble under the seam. Also - I didnt clean off all the residual glue soon enough - so I have a small amoumt of set glue showing at the edges of the tapes. But all in all, I was delighted with the job - it was a complete mystery to me starting out - but really no great shakes. Apart from the adhesive qualities etc of the one part evostik type glue - which I dont know about - My feeling is that the 2 part Hypalon glue is easier to use.
seems like we're all fat gits then....