Clear Tubing for Diy Cool Tubes

Anyone know where I can buy glass tubeing for cool tubes.Im needing a couple tubes for some cabinets Im building.Im putting 200 watt Fluros in the tubes.Any help would be great....
\thanks
MTM

No one knows where this glass is,I found some in clear sanitary glass on google but thats shits 125.00 for 4 ft.

Pyrex bread tube my friend: http://compare.ebay.com/like/310264609022?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&_lwgsi=y&rvr_id=233800676239&clk_rvr_id=233800676239&crlp=1_263602_309572&UA=?*S?&GUID=317b69dd12f0a47a0460fe30ff347571&itemid=310264609022&ff4=263602_309572

Thank you bro,thats exactly what i was looking for
peace
MTM

How big around are those bro,I cant find it on there or maybe Im overlooking it

Are they all 3 and 7/8 wide?

yeah there is only one size and it is 14"x3.75"