What are some good resources for 相声 and 小品?
You can get these on Youtube by searching the actor/actress's name. 

For instance, search "赵丽蓉" "巩汉林" will give you a lot of good 小品, and search for "马三立" for 相声 with Tianjin dialect. If you want 相声 with Beijing dialect, you can search "郭德纲".