First off, I got legit infineon tech IRFB7430PBF's from arrow.com, free overnight shipping, for $3.27 a piece.
Second, you can get cheap chinese ones off ebay, 10 for < $7 shipped: https://www.ebay.com/itm/10pcs-IRFB7430 ... SwqrtWm57Q
I ordered the ebays ones just to mess around... might build one of those android spot welders with them, one with the real thing, and compare.
Second, I feel bad for you if the hakko knockoff you got with this welder is your best soldering iron. I got a legit Hakko FX-951 (with T15 tips), and also have the Hakko FM2032 Micro soldering handpiece (takes T30 tips)... as well as just got the Hakko FR-300 desoldering gun.
The knockoff Hakko handpiece that came with the welder (well as an upgrade) works... and you can get the dirt cheap knockoff tips (so could replace your tip really often and cost next to nothing).... BUT... it doesn't even compare to the legit ones I have.
On a similar note, I've been wanting a hot air rework gun for a while... this time not going with an expensive name brand... just no need for that... was about to order the insanely inexpensive, yet according to reviews does it's job 858D (ie. $33 for one shipped: http://r.ebay.com/EzZvcO
) .... but decided to go with the HFS 959D through amazon (http://a.co/h2KWXZ1
) .... at $50 with free prime delivery, I get it in 2 days, if any problems super easy to return, apparently HFS backs it with a 1 year warranty and actually has really good customer service... and really the reason for getting the 'upgrade'... this one has a PID heating algorithm. I figure all that is worth the extra $17... I mean $50 for a fully functional hot air rework station... if I only knew about this a while ago, would have made things so much easier.
Edit: And on a side note... arrow.com is frocking insane. I ordered $25 worth of random small parts (something like 40 parts), with free overnight shipping. First off, every different part came in it's own almost 12"x12" antistatic bag (and the small ones came in a second smaller bag inside of that one). On top of that, that $25 order came as 4 separate boxes (didn't check all of them, but at least a few were from different locations, I would assume all were)... 3 of them were from the US... the 4th one I just got today (took 1 extra day).. from the Netherlands... guess what it contained?.... 3 x 1 uV 63v film capacitors.... total value/cost to me of these 3 shipped from the Netherlands (in a pretty damn large box for what an envelope would have done fine)... $0.52... yes 52 cents..... I almost feel bad, but I know why everytime I buy electronic components I at least try to get them from arrow
And on a completely different side note... trying my best to talk myself out of buying these: http://www.all-spec.com/Catalog/Hand-Po ... 2390-56114
... for $100, a set that large of quality WIHA (let alone their ESD) stuff... damn that't insanely cheap. BUT, I technically already have multiple sets of Wiha screw drivers (given, not their 1000v esd)... as well as a set of Knippex pliers/cutters... but damn, literally 2 od those pliers would normally cost $100, easy (of course they have more than that from wiha on sale.. def getting a few things... but trying my best to not buy that... its soo freaking tempting, such an amazing price.. but I really don't need them.... though they will definitely last my lifetime, and then some)