There is a new Visine printable coupon out there. The coupon does not say that trial sizes are excluded.
So click here  to print it and you can pick up a FREE trial size (I would check CVS for them).
If you would prefer getting a full size bottle there is a good deal at Rite Aid this week:
Visine is $5.29
Use $2 in-ad coupon
Use $2/1 Visine coupon 
Final Price After Coupons: $1.29
BUT you receive $1 in Up Rewards off your next purchase!