Depends where you live.
455 calories in a Extra-Large Slurpee at 7-11
it has 17 sugar cubes
This depends on where it was purchased and the size of the Slurpee. If I recall correctly, in Canada, a 28oz Slurpee was $0.89 in 1999.
1 Slurpee's costs $2.00. 2 costs $4.00
In Canada, in 1996, a 1-litre sized Slurpee was $0.99 CAD.
Unfortunately, drinking a Slurpee every day probably isn't very good for you. Simply put, a Slurpee has a lot of sugar and has no nutritional value (i.e. it has "empty calories"). That being said, having a Slurpee (or almost anything else) in moderation will likely do no harm.
Slurpee was created in 1967.
No you can not eat a slurpee