This is in the wrong forum. Don't be surprised if it gets moved to Dollars and Sense.
I bought a SL-D303 last week in like new condition with a cartridge for $20. The SL-D30 is basically the same table but was sold in 1982. The SL-D303 was sold in 1981. My deal was an exception because I knew the seller. He was going to toss it, but remembered I was into turntables and records. He was going to give it to me, but I threw him a $20 for a case of beer. From what I've seen on ebay and other sites, I would imagine these tables go for about $40 to $80, depending on condition. If it's in really nice shape and has a cartridge included, it might be worth $100. The SL-D30 only listed for $170 brand new in 1982. Would I pay that much? No, I would not, but I already have three tables.