I was just looking at the latest add from Harbor Freight Tools and they have a Mityvac kit for $28.99. This is probably the plastic one but I've been using that kind with no problem for the last 6 mo.
www.HarborFreightusa.com
I have some tools that I got from them and have had no problems so far.

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1983 300SD
200000miles

Sears has it here for $35

Click Here

You can probably get it for $29 by price matching Harbor Freight's price.
Harbor Freight does have retail stores so you should be able to do it.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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Harbor Freight is great! Whare else can you get tools that you'll probably use but once, at about 25% of the cost of the "good" tools? I've never had a problem with anything I've ever bought there. In fact, I bought their generic vacuum pump (i think it was like $15), and works fine for me!

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1989 300E 144K

Check this out (others avail too)
http://www.amazon.com/exec/obidos/tg/detail/-/B0002SQYUA/qid=1125685742/sr=8-2/ref=pd_bbs_unbuck_2/102-4539809-6224964?v=glance&s=hi&n=553294

Some Harbor Freight stuff is cr@p. I bought a really cheap rotary hand tool and it barely has the power to get a cutting wheel spinning. Put the cutting wheel against a plastic item like a wall switch plate and it stalls :/ The 1/2" click type torque wrench is a great deal at $10-15 when it goes on sale or even at the regular price of $20. I keep it in the car in case I have to pull a wheel away from home. I'm thinking of getting an extra long 1/2" breaker bar set for $14 but I'd hate to think where my knuckles will embed themselves if the hinge gives out

Sixto
95 S420
87 300SDL