You can get a Network Railcard as a Digital Railcard from Trip.com for £19.80, as per this
hotUKdeals post:
www.hotukdeals.com/deals/34-off-digital-railcards-1-year-railcard-ps1980-3-year-selected-railcards-ps4620-wcode-or-via-link-new-customers-4212630
The discount is only for new Trip.com customers (or at least new Trip.com accounts).
The post says you '"might" need to buy a train ticket from Trip.com to activate the Railcard, but I don't think there's any might about it - however a Network Railcard discounted
Ryde Esplanade to Ryde Pier Head Sunday single or Evening single is 95p - so total cost is £20.75.
You'll need to show the Digital Railcard in the Trip.com app, which is frankly a bit cr@p, but if you can tolerate that it's a 30% saving.
Another alterative would be to look for what some would call 'loophole fares', and others call 'value fares'... basically fares that are a bit of an anomaly, but cover the journey you are making - however they may not necessarily be straightforward to use in practice. You aren't going to get anyone posting any such fares in public though!