Present tracking apps might be of interest eg Santas bag, gift list.
Here are some useful websites:
Amazon free delivery tool here
Aliexpress www.aliexpress.com here . Useful tips here from sorryiasked: Aliexpress is a Chinese site that sells everything! Assume all branded stuff is fake. I personally wouldn't buy baby toys or electronics from there as I don't have faith in the product safety. But for fan merchandise, dolls clothes, "lego", household items etc it's great. Check the size guide on clothes and lower your expectations!
Use a seller who has a 4.5 star rating or higher.

You can pay via PayPal and there is an excellent tracking system, but be aware express postage is usually 2-3 weeks and standard postage up to 2-3 months.
Bargainmax here
Camelcamelcamel is a brilliant site that tracks prices on amazon here
Lisa angel sale is popular when on, apparently arrive nicely packaged too here
Magazine subscription offers here and here
Netpricedirect has discount toys and party bits here although be aware reviews of the site is mixed
Toys for a pound here
Any additional websites or recommendations to add - just let me know
. I should add something about Ali express maybe as we’ve had that before…will get my brain thinking about what other sites/products have been popular.