We are a smaller company specializing in backyard parties and smaller events. However, we were asked to participate in a large indoor event at the local convention center. We currently only have enough sand bags to support 4 concrete set ups, which has never been a problem in the past, because we maybe get one request a month for concrete. This event, however, we'll end up renting out the majority of our inventory. There will be 8 units set up, and possibly our large 22' slide. Right now, I can't see spending $600 on sand bags from Tent and Table and sand. Most likely, I'll need this weight for this event, then won't need it again for another year or two at the rate we're expanding. This lady also wants to barter an ad in a popular parents' magazine. This will obviously decrease our profit, so my question is: is there a SAFE way to make sand bags without spending an arm and a leg? I found the bags people would use to sand bag their house when there is a hurricane acomin'. We could possibly fill those and tie to them? Also, for the 22' slide, should I buy water barrels and fill them? I can get them locally for $15 a piece. What are everyone's thoughts?