Amazon offers its Amazon Prime members Rift for Windows
with free shipping
. (Non-members get free shipping with orders of $25 or more; otherwise, shipping adds $4.98.) That's $25 under our April mention and the lowest total price we could find, now by $18.
Of note, Rift is an MMORPG which requires a $15 monthly subscription fee.
Amazon Prime membership is $79 per year; however, Prime is free for college students for one year, and free for parents and caregivers for three months.