It depends on what it is and the cost of it. Stuff like a swing (I am considering individual swings..like infant ones or kid ones, not the full swingset, etc), I am used to penny pinching since I often buy those items for my home daycare with Grant money...every penny counts...shipping costs, free shipping, can I go buy it close by (loads of options near me), all factor in.
Other stuff I just like a certain brand or store so I watch for a sale or coupon % offs. I love Kohls Simply Vera Wang..but at regular prices I can not buy it..but its often on sale and I get the coupons for using with our store charge card (only store card we have).
Other stuff I have found a price I can live with. Like wipes. I am super picky about them...I do home daycare so I use a TON of them. I only like Huggies with a scent to them. Amazon, with the "subscribe and save" discount of 15%, along with the "mom club" thing (whatever its called), is another 15%...plus free shipping and a set arrangement to ship them at intervals (every month for me)...I get them 30% Amazons price, free shipping and they just show up at my door every month (an 8pk is just over $15. A price I can live with not to go get them.Most stores around here only carry the unscented ones. I hate those..picky, I know.)
Happy shopping!