J. Geils Band’s last album You’re Gettin’ Even While I’m Gettin’ Odd, maybe?
That was the first thing I thought of!
After David Bowie released his album Low, Nick Lowe put out an Ep titled Bowi.
Speaking of puns on the artist’s name, singer/guitarist Michael Roe released an album titled The Boat Ashore.
The Vapors - New Clear Days
Zep - In through the outdoor (I’m guessing there was pun intent)
Nick likes his plays on words. Probably caught it from Elvis Costello. There’s The Abominable Showman, and *Nick Lowe and his Cowboy Outfit *which I always assumed was a reference to both his clothing and his band. His song Switch Board Susan is chock full of telephone puns.
Cyndi Lauper had a greatest hits compilation titled Twelve Deadly Cyns
Who’s Next counts.
You have the question when addressing a group, “Who’s next?” and an album that also announces that it is the Who’s next --album.
Cream’s Disraeli Gears in a pun on the phrase “Derailleur Gear,” used to shift gears on a bicycle.
Elton John’s Honky Chateau. There’s a connection both between the chateau in France where it was recorded and the first single was “Honky Cat.” In France, “cat” is “chat” – like in Chateau. Hard to say if the single or the album was doing the punning.
I’ve always thought it meant “Who’s next to piss at the monolith?” 
Van Halen, OU812
1960s pop singer Tommy Roe’s greatest hits compilation was 12 in a Roe.
Nick’s first release in 1977 was an EP titled Bowi, a punny response to Bowie’s album Low.
That reminds of Pete Best’s album “Best Of The Beatles”, which of course was a bit misleading…
Flipping through my collection, a couple catch my eye.
Daft Punk - Discovery… Partially disco inspired, obviously released on a disc, and ‘discovery’ fairly describes the story attached to the album via Interstella 5555.
Ghost - Seven Inches of Satanic Panic… Within the band’s fiction, released as a 7 inch single in 1969, but that’s not the only 7 inches it’s referring to (Papa Nihil (the lead singer character on that one) was a randy bastard.).
Shonen Knife - 712… 7-1-2 can, through choice the readings and abbreviation, be read as naifu - knife.
The Grateful Dead’s 1974 At the Mars Hotel has a hidden title on the back cover: “Ugly Roomers.”
Also Dead Set, which was the electric counterpoint to the acoustic Reckoning, released in the same year.
And, similarly, Electric Light Orchestra’s Discovery is very disco-flavored (being released in 1979), and members of the band, including Jeff Lynne, have suggested that the title could be parsed as “Disco Very.”
Not really a pun, though, as “Disraeli Gears” has no meaning. Supposedly it’s just a mispronunciation by a Cream roadie.
Rock:
Butthole Surfers, Hairway to Steven
The Go-Go’s, Beauty and the Beat
Little Feat, Feats Don’t Fail Me Now
Country:
June Carter Cash, Press On
Johnny Cash, Heart of Cash
Dolly Parton, Greatest Hits (before you complain, check the album cover)
David Allan Coe, Once Upon a Rhyme
And, while it may not strictly be a pun, it always tickled me:
Joe Walsh, The Smoker You Drink, the Player You Get
Didn’t one of the Marx Brothers say that first?
If you want to stretch it out into song titles, here’s this tune from April Wine that actually made it onto MTV and the playlist of my local album rock station at the time.
Hayseed Dixie (whose name is, itself, a play on AC/DC) does bluegrass cover versions of rock songs, and has several punny album titles:
You said “if it’s true.” It sounded like you didn’t believe it.
^ Then you were reading into something I didn’t claim. “If it’s true” often just means that the person saying it doesn’t know if the claim is true or not.