Ah, I guess I should have detailed what I did .
I looked through the entire list of offers on TrialPay and saw an offer from Big Fish Games for Plants vs Zombies for the PC. I have been meaning to purchase this anyway, so I selected that offer. The price for PvsZ was $9.99. I then looked for a coupon code for Big Fish Games and found one for %50 off for new customers, e.g. NEW50. I entered the code and bam, $4.99. I couldn't believe I could purchase PvsZ for $4.99 and get PowerCmd for free, but I gave it a shot. Sure enough, the next day TrialPay verified my purchase and I received my PowerCmd serial number info. What a deal!
Note: Big Fish Games wants to sign you up for their game service, which I declined. They also require you install their 'game manager' in order to download PvsZ.