Ikea has some really nice prints, frames, etc., and they're really reasonably priced. www.ikea.com. You can also search www.etsy.com! The art category is here: http://www.etsy.com/category/art?ref=fp_ln_art. It's hard to pick out art for other people, though - I'd just search around and see what you like.
Amazon.com is the best place to buy cheap party decorations. Amazon offers many things to buy, from groceries to candy to toys and school accessories.
spirithalloween.com is the one stop shop where one can find cheap Halloween decorations. If it wasn't for this site most people will become broke for buying Halloween decorations.
Dollar Tree is a good store to buy cheap decorations for most every occasion. If you do not mind sacrificing quality for price, most everything is one dollar.
At Wal-Mart. They have plenty cheap and kid-friendly decorations. There's fake spiders, fake cob-webs, Winnie-the-Pooh decorations. There is just plenty.
Target is a great place to find cheap white Christmas decorations. www.christmas-trees-wreaths-decorations.com also has a wonderful selection of white christmas decorations to buy online.
In Nashville you can buy baby shower decorations at party city or walmart. www.partycity.com and www. walmart.com. THese are local stores that are found in every state for good quality and cheap prices.
Walmart
There are many stores where you can purchase a large variety of inexpensive Halloween decorations. One of the best places to buy these would be a dollar store of Halloween specialty store.
Most of the time I buy from Dick Blick, they have a huge catolog.
One will find cheap art tools offered at many stores that specialize in art tools. An example would be Michaels. Michaels offers a variety of art tools suitable for all ages.
You can buy cheap furniture at an office furniture liquidator. It will be in good condition but slight used and better quality than at the mass merchandisers.
Most Hobby Lobby stores have these kits, and they are pretty cheap.