After my current pad deflated on my last overnight trip (might be punctured - yet to check), I recently bought one of these Klymit pads from Massdrop (you need to sign up to see prices etc but it's free):
Massdrop x Klymit Ultralight V Sleeping Pad
https://www.massdrop.com/buy/41689Specs
Fabric: 20d nylon
Color: Stealth green (top), dark charcoal (bottom)
Insulation: 60 g/m2 synthetic
R-value: 4.4
Flush flat valves
Non-slip coating
Weight, stuff sack: 0.5 oz (14 g)
Designed in Utah
Short Pad
Inflation: 6–10 breaths
Dimensions, inflated: 60 x 20 x 2.5 in (152 x 51 x 6 cm)
Dimensions, packed: 3.5 x 3.5 x 7 in (9 x 9 x 18 cm)
Weight: 14.7 oz (417 g)
Regular Pad
Inflation: 8–12 breaths
Dimensions, inflated: 72 x 20 x 2.5 in (182 x 51 x 6 cm)
Dimensions, packed: 4 x 4 x 7 in (10 x 10 x 18 cm)
Weight: 17.2 oz (488 g)
Long Pad
Inflation: 10-14 breaths
Dimensions, inflated: 76 x 26 x 2.5 in (193 x 66 x 6 cm)
Dimensions, packed: 4.5 x 4.5 x 8 in (11 x 11 x 20 cm)
Weight: 25.6 oz (725 g)
I bought the short version which is fine for me as I'm only ~165-170 cm tall. Tiny packed size and weighs little. Have yet to field test it but in a lounge room test it felt very comfortable and seemed quite warm. I also like the sticky spots underneath to stop it sliding around. Prices are in USD - converted I paid ~A$63-74 shipped to Oz. Might be worth a look as it seems to fit your requirements and not too far off your budget limit, depending on which size you need.