I almost feel like I move from phone to phone a little too much, but after we bought my wife an iPhone 5s recently for $200 I started adding up what I have paid for WP devices in the last couple years and it isnt so bad.
Lumia 520 - $50 (AT&T GoPhone)
Lumia 630 - Free when switching to Cricket
BLU Win HD - $45 (Loved my 630 but I couldn't pass up that deal!)
Lumia 640 - $40 (AT&T GoPhone used on Cricket)
Lumia 1320 - $50 (Just ordered from Cricket's website yesterday. Came with free 2- Day shipping)
That's $185 over the last 2 and a half years on phones compared to the $200 we spent last year on my wife's iPhone 5c after her 4S broke and then $200 this year on a 5S when the 5c broke...