Magnetic Stir Bar
A look at what is currently available on eBay
 Electric Hot Plate w Magnetic Stirrer Hotplate Stir Bar US $169.95 
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 Set 4 magnetic stirrer bar stir mixer bars PTFE New US $13.90
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 Electric hotplate magnetic stirrer w/stir bar hot plate US $89.99
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 New 1 inch egg PTFE magnetic stirrer stir bar 100-250ml US $4.99
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 Fisherbrand Plus Cross Magnetic Stir bar 1-1/2" 38mm US $10.30
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 Magnetic Stir Bar 1"x 5/16" Teflon Coated, Package of 5 US $16.99
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 Fisherbrand Magnetic Stir bar 1-1/2" x 5/16" (38 x 8mm) US $6.65
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 Fisherbrand Magnetic Stir bar (76 x 13mm) 3 x 1/2" new US $10.50
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 Fisherbrand Magnetic Stir bar 3" x 1/2" (76 x 13mm) NEW US $12.95
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 PTFE 2 inch &1 inch magnetic stirrer bar stir bars 2pcs US $8.99
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 6 Fisherbrand Magnetic Stir bar 1-1/2" x 5/16" 38 x 8mm US $25.90
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 1 inch magnetic stirrer bar stir mixer bars PTFE New US $5.75
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Can you use a Teflon coated magnetic stir bar in a highly basic solution?
I am stirring a solution of pH 14 at room temperature (solution of distilled water, potassium carbonate, and potassium silicate)...if Teflon wouldn't work, what would you recommend?
Teflon stir bar should be fine. It was designed for that purpose.
Otherwise you can use the glass probe from your pH meter that you used to measure that pH of 14, and seal a stir bar inside of it.
Gold is unaffected by almost all basic and acid solutions too , only aqua regia (a combination of two acids), can dissolve it. encapsulate stir bar with gold.
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