I would try two options for a bike:
Option 1
Awesome deal this week (If price is more of a concern)
$99.99 out the door since you're in the land of no tax
Bestbuy has the
Garmin Nuvi 200 on sale for $149.99
1. Sign up for a free rewards card if you don't have one
2.
$50 coupon
YMMV/Things to note
*These may sell out if they have not already
*The sale price ends this Saturday
*Some Best Buy's may try to tell you, you can't use a coupon on a sale item (BS)
Option 2
I prefer my etrex series Garmin over the nuvi (I'm on my 4th etrex now, only owned the nuvi for a few days)
-Not 4th as it is a worthless POS and keeps breaking, I keep upgrading to newer/better models-
My latest etrex is the
Vista Hcx from ebay $205 shipped (using a 10% off paypal coupon which expired 6/30 -sorry)
Since you're in OR (I would use
Amazon) sales tax in WA killed the Amazon option for me
The Amazon search I linked to above should show you many etrex models and bike mounts.
I use it as a backup in the car, geocaching, hiking, camping, biking, traveling to unfamiliar cities (US / Europe / etc...)
Battery life on my etrex is 12-15 hours on average
I've even used the etrex on my FJR for over a year (completely waterproof GPS) before I upgraded to a Garmin 2730 with XM
I used this mount from
cyclegadgets which would also work great on a bike.
Hope that helps