Some odd high end routers may have one or two 2.5Gb or 10Gb, but that's it.
That was the case for 2.5Gb until about 2 years ago (although still the case for 10Gb), although that likely accelerates faster 2.5->10 than the long wait from 1->2.5. The thing was commercial networks needed 1Gb long before home internet (especially in the US for the most part).
Last year D-Link added cheap desktop switches with 2x 2.5Gb+ 5x 1Gb for about $60 (bought one for the parents' Fibre/Tv setup [which has separate 2.5Gb and a 10Gb port on the modem]), and 5x2.5 and 8x2.5Gb for about $100 +/-, even their gaming switch with 1x 10Gb and 5 x 2.5Gb is about $200. So Those are cheaper than most WiFi6E modems, which are now starting to come standard with 2.5Gb ports.
I'll take 2.5G or 5G as the minimum if there are legitimate cost savings (starting with those working on Cat 5e cables). 10G would be great, but we might as well fully transition to the literal stopgap standard first.
If it's only a matter of pennies per device, then yes, move straight to 10G please.
For short runs (under 60ft) Cat5e is fine for 5Gb, and will even do 'OK' with 10Gb at half that, but usually we are talking about last few dozen feet for these routers/switches. For 2.5Gb+, if you're feeding a centralized modem throughout an old house network, it'll struggle past 2.5 beyond 100ft, so you might need to prioritize ports.
Right now, I think you have to work hard to find just Cat5e anymore, almost everything is by default Cat6 for the cheapest and Cat7 in general with Cat8 being the one where you notice the price jump. Are they true to spec, meh, kinda like HDMI/USB/TB/DP compliance, usually good enough, sometimes not, but most will get it done.
As to the price difference, I'd say for most network hardware vendors, 5Gb isn't worth the focus of a spec stop, most devices I see are 2.5Gb then 10Gb in their offerings, and the split is usually 1/2 vs many as for consumer vs commercial.
Where 5Gb is still going to be the mid-way point IMO, will likely be laptop integrated connections, and even that likely goes to 10 Gb in a coupla years. The limiting issue is the form factor support and dislike of external dongles. (edit: although realistically MOST laptops have completely done away with an ethernet port, with just the higher end & gaming/workstation laptops getting 2.5Gbs+ , some of those have started showing up with 5Gbs last fall).
Most Desktop Mobos will likely go straight from 2.5Gb to 10Gb on the high end and stay 2.5Gb in the middle for near term, just because it's so easy to get as an add-in card as a desktop it won't matter..... except for gamers whose spare slots are taken up by GPU blowers, and those mfrs won't want to look like they are lacking when people compare vendors, especially not for Enthusiast/Gaming MoBos that demand a premium price, it's an easy spec bump that might show utility in many ways for that group vs much more limited use in the low/mid-range IMO.
Not everything needs it though, I still have majority of my smart gear and security on quality T10/100 POE switches, because I'd rather pay for reliability over speed if the devices don't need it, just 2 computers, TV, AppleTV and an Extender are on GB+ (Why 4K/120 [even 8K] TVs still have only 10/100 ports ANNOYS me [again pennies per TV], had to put USB dongle on my Sony ! 🤬)
I just wish new network gear was as widely durable as old stuff, now it is a little more hit/miss even with 'known' brands IMO.
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