RAM Upgrade for My Dell Inspiron 15 5505

Hello

I have just bought an Inspiron 15 5505 4700U 8GB 512SSD, and I was wondering how to go about upgrading the ram.
https://www.ebay.com.au/itm/Dell-New-Inspiron-15-5505-Laptop...

I looked at Dells website and they are charging $138.55 for an 8GB SODIMM stick.
https://www.dell.com/en-au/work/shop/dell-memory-upgrade-8gb...

I am wondering what other options do I have?
Do other places sell the same stick at a cheaper price.
If not would I need to buy two new 8GB SODIMM sticks of RAM so that they are matching.

Thanks for any knowledge shared as I don't know a lot about laptops.

Also also, does anyone know a good laptop case that would fit this laptop?

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