My quick search for this SIB is £999.99 Honwave T38-IE2 inflatable | Honwave and Outboard packages | Ely Boat Chandlers
plus £50 shipping (maybe find out how they ship it for £50?)
Actually on the back of that I get deliveries from Cornwall to London for £50 pallet charge so maybe your £124 is a touch heavy, meeting a courier in the nearest town - if you do go that route - would shave something off the price. Craig from Anyvan I messaged last night would do it for £120 you might find another company for less than that. My Yorkshire to London quotes started at £150+ and ended up as a part load for £50
That eBay listing has had a flurry of activity which suggests it might go for more than its worth, if it went for 650-750 plus your shipping I would think that fair, sub 650 it's a deal. Man maths would say in your location you'd prob have to spend £40 on fuel round trip (includes waiting time for sheep) so another £80 is the extra shipping cost..? Another thing to think about is the elusive outboard, might you have to go through the same process of travel or shipping if you find a good one of those?
New boat with new wheels £1200 ish (includes delivery but would that include West Coast Scotland)
Used boat with used wheels (near new in this case) £850 ish ~ unless the auction goes higher than my guess (includes £120 or so for a pallet or courier)
I suppose it depends how quick you want to do this, maybe something will come up as a package nearer where you live