A lot of the guys I've talked to and who have answered this question before don't tip. They give gifts. I have given gifts for a long time. I find out if they collect things, and if they do I get them what they collect.  Or I just ask them what they like so I can get it for them.  I have given tips from time to time and they have ranged from 100 to 300.

Remember the wife up in New England who cut his thingey off and threw it out the window of the car?

I can hear the officer out on patrol now (after the call was put on the police radio)... "Be on the lookout for a WHAT???????"

These providers are working for $$
Do not insult them by giving them a STUPID stuffed animal or flowers.
It the provider gave you good service you should give them a nice tip.
Remember that if they are working for an agency, the house takes a good share of what you pay.
DON"T BE CHEAP!