I go on a retreat yearly...Friday through Sunday including all meals it is $100.00...very reasonable...we do our projects...it is only 1/2 hour from home, so if you have to leave and come back, not too far away.
Other retreats we do are "day retreats"...renting a local community center room for the day...usually about $10.00 for the day once we divide the cost amongst all of us. We bring our own food...usually a pot luck for lunch, and then we order out for dinner. Just did one of these yesterday...always so much fun.
We will be doing a 3 day one in April....we are calling it a "sleep in your own bed retreat"...we will sew all day at the center, and then go home, sleep and come back next day...all our stuff set up and ready to sew....hours will be Friday 5-10, Saturday 8am-9pm and Sunday 8am-5pm will cost us about $25.00 each.