Many states are now pushing online retailers to charge sales tax for their state. This is being heavily pushed to be imposed for all states.
Not to be a Debbie Downer, but if you live in Illinois you should've been paying a "use tax" on all goods purchased online.
http://tax.illinois.gov/individuals/faqs-use-tax.htm
You owe Illinois Use Tax if you purchase an item:
- for use or consumption in Illinois, from an out-of-state retailer who charges no Illinois Sales Tax or charges sales tax at a rate lower than the Illinois rate, and on which sales tax would normally be collected if you bought it from a retailer in Illinois.
Examples include: purchases from an internet site that does not charge Illinois Sales Tax, catalog purchases from an out-of-state retailer who does not charge Illinois Sales Tax; purchases through an out-of-state home shopping television network that does not charge Illinois Sales Tax; and items purchased while you were in another state from a retailer who charged sales tax at a lower rate than the Illinois rate or in a foreign country.