having a green tweed coat crisis

[Moomin]

help! am going to a wedding on saturday and have sorted an outfit (black skirt, black top, fishnets, knee length boots and lurvely green jewellery including fab green gen broach(/brooch?!). have now set my heart on green coat, preferably a tweedy one but have had very little luck tracking one down.
found one in debenhams that sort-of fits the bill but in the shop they didn't have my size. could always buy online but in the shop they have an offer of £25 off the £65, which they are not doing online! Can't get to a bigger store between now and saturday so am in a quandry about whther to buy coat in store for extra money (but i'm also losing weight at the moment so the one that's too big will be way too big soon!) or order online and pay extra.
OR does anyone know of any other coats for under £100 that fit the bill and i can buy for sat?
and don't advise me not to wear what i'm wearing - i've set my sad heart on it

Matalan did have some coats like that in recently.

Saw a green wool coat advertised in goodhousekeeping xmas edition. Looks great from Matalan £45

green coat update - had a mad hour's shopping the other afternoon. had almost given up hope when i went into a huge branch of dotty p. found some green tweed coats and was just about to try one on when i spotted a bottle green suede coat, fitted, with green fur collar and cuffs. sounds dodgy i know but looked yumptious. tried it on and it fitted perfectly. reduced from £80 to £60. wore it on saturday and felt lovely. hurrah!