[DIYbio] Electroporator purchase help / advice sought

Dear DIY Bio community,

I seek your help in identifying a used, fully functional bacterial electroporator for garage lab use.

I've found a few on Ebay, but some of them are in the price range of $1000 - $3000, which is almost an order of magnitude more than my budget, which is ~ $300 - $500 including tax + shipping.

Often times, I find the setup includes, if it is BioRad,
the gene pulser, 
the capacitance extender, and 
the pulse controller, 
but missing the shocking chamber. I wonder if the cuvette chamber is the first item in the setup to breakdown? To make things worse, the cuvette chamber aka shock chamber costs > $500 just by itself.

So I wonder whether there are secret / hidden / obscure sellers, incuding but notl imited to Ebay, and LabX.com etc, from where I can buy an electroporator (BioRad preferred, but not mandatory) that is fully functional for bacterial gene transfer (not interested in eukaryotes).

Thanks, and some links from my online research are listed below.

Best,
Tom

JUST CHAMBER
https://www.ebay.com/itm/Biorad-MicroPulser-Electropcrator-Shock-Chamber-Assy/143546859131?_trksid=p2485497.m4902.l9144

FULL SETUP
https://www.ebay.com/itm/BIO-RAD-Gene-Pulser-Pulse-Controller-Capacitance-Extender-plus-Chamber-shock-qz/193210236659?hash=item2cfc3a3ef3:g:c7UAAOSw7oldztU1&autorefresh=true
https://www.ebay.com/itm/BIO-RAD-Gene-Pulser-II-Pulse-Controller-Capacitance-Extender-plus-Chamber-shock/153804889929?hash=item23cf7c5f49:g:NL0AAOSwgZpduPcM
https://www.ebay.com/itm/BIO-RAD-Gene-Pulser-II-Pulse-Controller-II-Capacitance-Extender-II-Chamber-4652/263745627533?_trksid=p2485497.m4902.l9144

PARTIAL SETUPS
https://www.ebay.com/itm/Bio-Rad-Pulse-Controller-Capacitance-Extender-and-Gene-Pulser/233318965856
https://www.ebay.com/itm/Bio-Rad-Pulse-Controller-Plus-with-MicroPulser-Shock-Chamber-II/274284018442

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