I have both of these scopes. The 3.5-10x40 matte I bought new in 1997 for my Sako m75ss 300WM when I ordered it in. Still on the rifle today.......no issues, only time reset scope was when I switched to Accubonds in WS ammo in 2004 and just abit when I started to reload in 2005.
I bought the 6.5-20x40 AO matte with Fine-Duplex, off a fellow in BC about 6-7 years ago....payed $625 shipped. Never had a rifle for it for another 3. Sits ontop of my Sako m75ss 22-250.
I would say $300-400 is my estimate for your scopes now.
I bought a new VX3 4.5-14x40 with BC reticle from P & D Enterprises back in March for $450-475 (cant remember exact price but it was below $500) as it was Leupold clear out / demos days. This scope retailed for $770. My scope was new in box, never handles but the box was worn abit from being taken to gunshows....who cares...great price it was for me..now sits on my Sako m75ss 270WSM. I was looking at buying used off CGN but then this deal come up so I snagged it. I told a buddy and he picked up a VX2 6-18x40 for $400.