First of all, voters had absolutely nothing to do with this decision, it was Israel lobbyists. You do realize that Israel is receiving billions of dollars of taxpayer money right? If you were actually concerned about wasted tax dollars, you'd be advocating to cut off their funding.
Second, there is zero proof that Israel provides goods at a discount, show your work.
Third, in your fabricated scenario, a fourth company would just come in and buy the (fictitious) discounted parts and win the bid. That's how the free market works.
You're clearly not arguing in good faith, so this is the end of the conversation for me.