Training Suggestions for a Tight Budget

Hello everyone. I recently just finished my probationary period as a service desk specialist and my supervisor informed me that I have $800 to spend on training between now and the end of our fiscal year (June). Most OLL courses I've looked at start around $1800 and go up from there. I checked for any semi-local tech conferences/seminars that may be coming up but there doesn't seem to be much going on until later in the summer. I don't intend to leave any unspent money on the table, and as long as I can justify the expense (i.e. relate it to my duties, which I do a little of everything--security, network, desktop support, etc...), my supervisor will support it.
So, I'm hoping the TE community can offer some ideas for training to get the most bang for my buck. So far I've considered buying books or possibly a 1 year sub to CBT nuggets (although this slightly exceeds the $800 limit), but I'm curious what sort of training others have had with a limited budget. What say you?
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