There is no minimum weight but they cannot weigh more than 3.5 grams.
On average 3.2 grams or 0.11 oz
5-6 lbs
2 lbs. 2 oz
ASTM International Standard F 1979 - 04, Standard Specification for Paintballs Used in the Sport of Paintball,specifies in requirement 3.3 that paintballs shall not weigh more than 3.5 grams. There is not a minimum weight requirement.
One can find discounted paintball accessories from Just Paintball, Paintballing, Discount Paintball, Zephyr Paintball, Outpost Paintball, Paintball UK and Armed Paintball stores.
The weight depends on the gun, you can get little cheap guns that weigh less than 5 pounds and can get as large as real firearms and weigh over 15 pounds.
One pack of ritz crackers weigh 10.3 ounces. (Not estimated)
A used one is about 85$ to 90$.
At a paintball facility. If you search for paintball in your area you might find one.
You can buy a new Triton paintball gun for around 90 dollars, but you could also try buying one on ebay or amazon for a much cheaper price.
No. Grapes are much larger than paintballs and paintball barrels. Even if you found a small one, it would break in your gun.
They weigh one pound