Keep in mind regular "mesh" tarps are not the same as the nets used for bees. Bee nets are not designed to keep the weather out, they are designed to keep the bees in. You WANT ventilation. I suspect if you used a regular tarp to go any distance you would end up cooking your bees. Expect to pay a few hundred $ minimum for a semi sized bee net. The last one we bought from Dolan Tarp ran about $600 if memory serves, but just this week we bought 2 used ones in like new condition for $300, a great price.
Sheri