Tamron 70-210

[ketem]

I have an older (20 years?) Tamron 70-210 1:4-5.6 that is in need of repair. The slider tabs have all snapped off. I need a place to ask how much to fix it... I am in western Canada. or am I better off getting a newer one?
Just moved up from a Pentax K1000 to a Pentax K200D