Try the Oriental Trading company. ( www.orientaltrading.com ) They have a large variety of cheap party supplies and other novelty items.
This would be a company that provides supplies and can even coordinate events for a party. They can even plan and organize parties for large organizations.
Iparty can be a great place for party supplies. Also, check your local dollar store. They usually offer party supplies at very low prices, and you may find those hard to find items that the other stores don't have.
Yes, I am sure bulkpartysupplies.com has purple camoflage party supplies. If not, why not look at amazon.com, they always have cheap and fun party supplies!
My personal favorite online stores for cheap party supplies are www.orientaltrading.com or www.celebrateexpress.com. They both also off special deals on free shipping!
You can find cheap party supplies for almost any theme at Birthday Express. You can check out what they have to offer here: http://www.birthdayexpress.com/
Partycheap.com is a good place to start when looking for party supplies and favors. From the site you can search specifically for pony related supplies.
http://www.thepartyworks.com/ is a great place to find birthday supplies.
You can buy cheap kids birthday party supplies in Philadelphia at the national chains such as Party City or Toys R Us. Both have large selections and good prices.
The 10 best stores to buy party supplies at are Oriental Trading Company, Party City, Zurchers, Party Supplies Hut, Shindigz, Party America, Diamond Rental, Party Supplies World, Anderson's Giant Party Store, and Partypro.
Party City has a huge selection of Transformer party supplies. Another great resource for purchasing these would be on the internet. There are tons of great party suppliers who sale at cheap prices online.
I recommend checking out http://www.partycity.com for super cheap deals on party supplies for any occasion. If you want more specific themes, you should try http://www.birthdayexpress.com.