dude at the checkout line at walmart they sell chew toys for $0.88 a piece..i buy a new one everytime i go..i have a 4.5 month old golden retriever who is teething right now and i just keep all of them in a basket...he takes one out when he wants it..(i need to teach him to put them back) but if he destroys one im only out less than a dollar.

also buy some bitter apple spray from any pet store and spray it on stuff you dont want him to chew...i sprayed it on the fringe on my couch, the fring on my rug, the corner of my night stand and some other various things..it tastes bad so they stop chewing on it.

the most important thing w/ labs is supervision especially when they are young..when any retriever gets bored they tend to chew up everything.