I think you also need to decide how long your workshop is going to be. Are your driving there & back same day or spending the night? I have checked into getting someone for our guild, and it always includeds travel, meals and overnight stay if needed. Cost of the workshop is separate rate. The guild should pay your travel expenses and those that are taking your workshop pay for that, that is unless the guild is paying for the whole thing. I think that $150 is the least you should charge for travel & expenses plus cost of workshop. JMO!