Cheap, but not SUCH a bargain!

I recently placed an order online which, fortunately in this case, didn't go through, for item 203905 OPI 4 piece ultimate treat collection, priced at a special £29.88. Being an inquisitive individual, I trawled the QVC website, to find the items individually, and to compare the prices. So whilst, obviously, one postage charge is less than 2, here is what I discovered : 203390 OPI pink envy and avoplex £16.72; 214952 OPI Twice the envy £17.00. Disregarding the p+p, totals to receive the identical prooducts are : £29.88 v £33.72.