Impressively close to a p8 oscillator, but unfortunately it's one cell off if you look closely:

`x = 10, y = 13, rule = B2ce3-ajnr/S12-ak3-a`

8bo$8bo$o8bo$obo$2bo4$2bo$obo$o8bo$8bo$8bo!

EDIT: Nope.

`x = 16, y = 5, rule = B2ce3-ajnr/S12-ak3-a`

2o12b2o$5bo4bo$b2o2bo4bo2b2o$5bo4bo$2o12b2o!

EDIT: There it is!

`x = 16, y = 7, rule = B2ce3-ajnr/S12-ak3-a`

14b2o$9bo$2o7bo2b3o$6bo2bo$b3o2bo7b2o$6bo$2o!

EDIT: Some reduction work:

`x = 12, y = 5, rule = B2ce3-ajnr/S12-ak3-a`

7bo$7bo2b2o$4bo2bo$2o2bo$4bo!

EDIT: Okay, so my oscillator isn't on Catagolue, but this similar one is. It uses the same mechanism, but with a glidot:

`x = 4, y = 10, rule = B2ce3-ajnr/S12-ak3-a`

b2o2$2bo$3bo$bo$obo$bo$obo$bo$bo!

EDIT: Another oscillator that hassles the same object courtesy of Catagolue:

`x = 3, y = 8, rule = B2ce3-ajnr/S12-ak3-a`

bo$bo$obo$3o3$bo$bo!

EDIT: 6G of

xp2_44h0h44:

`x = 29, y = 15, rule = B2ce3-ajnr/S12-ak3-a`

19bo7bo2$18b2o7b2o$bo$bo$o22bo$23bo$22bobo$23bo$6bo16bo$5bo$5bo$18b2o

7b2o2$19bo7bo!

EDIT: Spectacularly useless:

`x = 11, y = 15, rule = B2ce3-ajnr/S12-ak3-a`

bo7bo$bo7bo$o9bo3$5bo$5bo$4bobo$5bo$5bo3$2o7b2o2$bo7bo!

[[ STOP 15 ]]

EDIT: 6G of frozen clock, still expensive but now at 1 glider per bit:

`x = 29, y = 16, rule = B2ce3-ajnr/S12-ak3-a`

27bo$27bo$19bo8bo$17bobo$25bo$o24bobo$o$bo2$21bo$21bo3$26bo$b2o22bo$o

24bo!

EDIT: A p4 billiard table:

`x = 11, y = 11, rule = B2ce3-ajnr/S12-ak3-a`

2bo5bo$2bo5bo$2obo3bob2o$2b2o3b2o$4bobo2$4bobo$2b2o3b2o$2obo3bob2o$2bo

5bo$2bo5bo!

EDIT: It's appeared on Catagolue in C2_1 and D8_1, never mind. However, C2_1 has this particularly impressive p4:

`x = 7, y = 7, rule = B2ce3-ajnr/S12-ak3-a`

bob3o$3ob3o$6o$obobobo$b6o$3ob3o$b3obo!

EDIT: And these very similar p2s:

`x = 11, y = 11, rule = B2ce3-ajnr/S12-ak3-a`

5bo$3b2ob2o$5bo$bo2bo4bo$bo2bob2obo$obo5bobo$bob2obo2bo$bo4bo2bo$5bo$3b2ob2o$

5bo!

`x = 13, y = 13, rule = B2ce3-ajnr/S12-ak3-a`

6bo$6bo$5bobo$3b2obo2bo$6bo2bo$2bo7bo$2ob2o3b2ob2o$2bo7bo$3bo2bo$3bo2bob2o$5b

obo$6bo$6bo!