I don't think money laundering works like that. Two people working together would need to sell a cheap item for a lot of money. You don't launder money by sending someone a really expensive welder at half price.
Clearly you've never had a few million in ill-gotten proceeds and wanted to buy a house!
Its easy...
Start with a large pile of "dirty" cash. Typically this will be your mafia, drug cartel, Senate committee for campaign reform, or otherwise well organized criminal element with insane sums of money to "legitimize."
Create shell organization/individual. This is where your low level "thinking criminal types" come in, just smart enough to be useful to the larger enterprise, but yet entirely expendable.
The shell purchases items that can be quickly resold, often for a loss. But you don't want too many cheap things, too much leg work. And you don't want tracked items like cars or amounts that raise banking system alarms. Welders? Perfect. Buy them up at auction from defunct retailer chain.
Resell the ill gotten goods 60-75% off in one shot, via a highly anonymous and rapidly paced marketplace, like hmm... ebay? And of course you do indeed supply the merchandise you promised because you don't want a law enforcement investigation starting there and potentially swimming up into your laundering stream.
Your shell organization/person now has completed the first, shall we say, "agitation cycle" of the laundering process, and the money can be passed into a larger laundering channel, and eventually into somebody's actual pocket for legitimate use.
...
FedEx tracking now says it's, "On FedEx vehicle for delivery."
And then in grey font below... "Scheduled for delivery next business day."
And so, we wait.