The Fugenass / Fugenboys clones are back at Lidl next week, along with
other DIY stuff:

http://www.lidl.co.uk/cps/rde/xchg//...fferdate=31238

(If this link doesn't work without a store being specified, click on
offers for 21.05.2012)

I can recommend the sealant gun as being a step up from the typical
skeleton style.