I used to buy all my tyres mail order and fit them myself but with modern bikes and low profile radial tyres this isn't really an option if I don't want to damage the paint on the rims.
I usually go up to Strathearn Tyres in Crieff who do a ride in ride out service at very competive prices, do the job quickly and efficiently and balance the wheels properly. all at very competitive prices.
I could buy these tyres mail order but then I have to find somewhere local to fit them and balance and it also means taking both wheels off the bike, which I can do having a front stand as well as the centre stand and an Abba stand but it's a hassle and how much would I really save.
I presume that there will be £10 or so delivery charge on the tyres, then there will be another £10 a tyre fitting charge which will have put the £140 mail order price up to £170 which is not that far short of the 180 odd pounds I might be paying for comparable tyres at Strathearn and unless the tyre fitters are specialising in bike tyres they probably won't be able to balance them and might well score all the paint on your wheels.
Unless I can be convinced otherwise I'll continue to by my tyres at Strathearn